Geologic-Tectonic Map of the Gulf of California and Surrounding Areas
Published:January 01, 1991
Scott S. Fenby, R. Gordon Gastil, 1991. "Geologic-Tectonic Map of the Gulf of California and Surrounding Areas", The Gulf and Peninsular Province of the Californias, J. Paul Dauphin, Bernd R. T. Simoneit
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The Gulf of California is one of a group of structures which have resulted from the coincident westward dilation of North America and the dextral motion between the Pacific and North American plates. During the early history of the Gulf, this dilation occurred above a subduction zone.
We have subdivided this large province into 22 structural domains, each with a contrasting geologic history and have divided these histories into four intervals. The earliest of these is prior to 23 Ma, when the first nonmarine strata ponded in the initial depression. The period from 23-13 Ma was the premarine interval of arc volcanism; 13-5 Ma was the Protogulf era; and 5 Ma to the Present was the era of the modern Gulf.
The earlier intervals, characterized by large elevational changes and dilation unrelated to rhombochasmic opening, contrast with the recent interval characterized by passive strike-slip translation south of the Transverse Ranges.
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The Gulf and Peninsular Province of the Californias
The Gulf of California is an excellent laboratory for studying sedimentary processes on time scales that are not resolvable in the open ocean. The high biological productivity and the unique physical character of the gulf combine to produce sedimentological processes that preserve annual phenomena. This volume is organized into six sections. Part 1 covers historical exploration of the area. Part 2 includes 5 chapters detailing information contained on the 5 fold-out maps that accompany the volume. Part 3 consists of chapters on regional geophysics and geology. Part 4 covers satellite geodesy. Part 5's seven chapters discuss physical oceanograpy, primary productivity, and sedimentology. Part 6 covers hydrothermal processes.